[122/227] mm/hwpoison: add in-use hugepage hwpoison filter judgement

Commit Message

Andrew Morton March 22, 2022, 9:44 p.m. UTC

From: luofei <[e-mail]>
Subject: mm/hwpoison: add in-use hugepage hwpoison filter judgement

After successfully obtaining the reference count of the huge page, it is
still necessary to call hwpoison_filter() to make a filter judgement,
otherwise the filter hugepage will be unmaped and the related process may
be killed.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: luofei <[e-mail]>
Reviewed-by: Miaohe Lin <[e-mail]>
Cc: Borislav Petkov <[e-mail]>
Cc: Dave Hansen <[e-mail]>
Cc: H. Peter Anvin <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Naoya Horiguchi <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Cc: Tony Luck <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 mm/memory-failure.c |    8 ++++++++
 1 file changed, 8 insertions(+)

Patch

--- a/mm/memory-failure.c~mm-hwpoison-add-in-use-hugepage-hwpoison-filter-judgement
+++ a/mm/memory-failure.c
@@ -1534,6 +1534,14 @@  static int memory_failure_hugetlb(unsign
 	lock_page(head);
 	page_flags = head->flags;
 
+	if (hwpoison_filter(p)) {
+		if (TestClearPageHWPoison(head))
+			num_poisoned_pages_dec();
+		put_page(p);
+		res = -EOPNOTSUPP;
+		goto out;
+	}
+
 	/*
 	 * TODO: hwpoison for pud-sized hugetlb doesn't work right now, so
 	 * simply disable it. In order to make it work properly, we need